diff --git a/pkgs/applications/virtualization/virtualbox/default.nix b/pkgs/applications/virtualization/virtualbox/default.nix
index f699119c5f04..ea98d1ce7a9d 100644
--- a/pkgs/applications/virtualization/virtualbox/default.nix
+++ b/pkgs/applications/virtualization/virtualbox/default.nix
@@ -121,7 +121,7 @@ in stdenv.mkDerivation {
         --base-dir "$libexec/ExtensionPacks" \
         --cert-dir "$libexec/ExtPackCertificates" \
         --name "Oracle VM VirtualBox Extension Pack" \
-        --tarball "${extensionPack}"
+        --tarball "${extensionPack}" \
         --sha-256 "${extensionPack.outputHash}"
     ''}